Thanks Ion for the clarification and workaround.

On May 28, 2017, at 4:02 PM, Ion Gaztañaga via Boost-users wrote:

On 27/05/2017 21:43, Gene Kang via Boost-users wrote:

...

I’m using boost::movelib::unique_ptr with a polymorphic container of type boost::container::vector and getting a compiler error that I can’t seem to figure out (see code sample and attached compiler output). Note, this error occurs when compiling without C++11 support w/ x86-64 gcc 4.9.3. When compiling w/ C++11 support (e.g. -std=c++11) the code compiles fine. Any ideas ? Thanks in advance for any help on this.

Move emulation in C++98 does not support automatic conversions from derived to base classes.

Try converting to FooAPtr first:

#include #include

class FooA { public: FooA() {}

virtual ~FooA() {}

virtual void execute() {} };

class FooB : public FooA { public: FooB() {}

virtual void execute() {} };

int main() { typedef boost::movelib::unique_ptr<FooA> FooAPtr; typedef boost::movelib::unique_ptr<FooB> FooBPtr;

boost::container::vector<FooAPtr> fooVector;

FooBPtr fooBPtr(new FooB); FooAPtr fooAPtr(boost::move(fooBPtr));

fooVector.push_back(boost::move(fooAPtr));

return 0; }

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